Imatra is a town in Finland, located in the southeastern interior of the country. Imatra is located in the region of South Karelia, on Lake Saimaa, the River Vuoksi. The population of Imatra is approximately 25,000, while the sub-region has a population of approximately 37,000. It is the 41st most populous municipality in Finland.

The Vuoksi is a river running through the northernmost part of the Karelian Isthmus from Lake Saimaa in southeastern Finland to Lake Ladoga in northwestern Russia. The river enters Lake Ladoga in three branches, an older main northern branch at Priozersk (Käkisalmi), a smaller branch a few kilometers to the north of it, and a new southern branch entering 50 kilometers (31 mi) further southeast as Burnaya River, which has become the main stream in terms of water discharge. Since 1857, the old northern distributaries drain only the lower reaches of the Vuoksi basin and are not fed by Lake Saimaa. The northern and southern branches actually belong to two separate river systems, which at times get isolated from each other in dry seasons.